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[Discuss-gnuradio] using GNU radio to generate audio signals

From: Brad Buran
Subject: [Discuss-gnuradio] using GNU radio to generate audio signals
Date: Tue, 8 Jun 2010 14:59:16 -0400

In our research lab we generate a variety of audio signals to study
auditory perception.  These signals include pure tones (ramped on/off
by cosine squared envelopes), amplitude-modulated noise, sequences of
signals (noise followed by a tone, etc.), band-limited noise, etc.

Once we generate the waveform, we upload it to an external hardware
device that plays the signal out to a speaker.

GNU radio seems like a very interesting project because it looks like
it can generate a continuous waveform as a series of frames which we
could then upload to the external device.  If I understand GNU radio
correctly, this would allow us to fine-tune the output signal in
real-time (e.g. adjust modulation frequency, etc) and the next frame
would have the updated signal (rather than having to recompute the
entire waveform).

Does this sound like a reasonable use case for GNU radio?  Would we be
able to grab the output of the block "chain" and upload it to the
hardware ourselves?  It looks like using a vector sink may work for
that purpose.

Brad Buran
Postdoctoral Fellow
Center for Neural Science
New York University

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